/*
  The oSIP library implements the Session Initiation Protocol (SIP -rfc3261-)
  Copyright (C) 2001-2012 Aymeric MOIZARD amoizard_at_osip.org
  
  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.
  
  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.
  
  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include <osip2/internal.h>
#include <osip2/osip.h>

#include "fsm.h"
#include "xixt.h"

int __osip_ict_init(osip_ict_t ** ict, osip_t * osip, osip_message_t * invite)
{
	osip_route_t *route;
	int i;
	time_t now;

	OSIP_TRACE(osip_trace
			   (__FILE__, __LINE__, OSIP_INFO2, NULL, "allocating ICT context\n"));

	*ict = (osip_ict_t *) osip_malloc(sizeof(osip_ict_t));
	if (*ict == NULL)
		return OSIP_NOMEM;

	now = time(NULL);
	memset(*ict, 0, sizeof(osip_ict_t));
	/* for INVITE retransmissions */
	{
		osip_via_t *via;
		char *proto;

		i = osip_message_get_via(invite, 0, &via);	/* get top via */
		if (i < 0) {
			osip_free(*ict);
			return i;
		}
		proto = via_get_protocol(via);
		if (proto == NULL) {
			osip_free(*ict);
			return OSIP_SYNTAXERROR;
		}
#ifdef USE_BLOCKINGSOCKET
		if (osip_strcasecmp(proto, "TCP") != 0 && osip_strcasecmp(proto, "TLS") != 0 && osip_strcasecmp(proto, "SCTP") != 0) {	/* for other reliable protocol than TCP, the timer
																																   must be desactived by the external application */
			(*ict)->timer_a_length = DEFAULT_T1;
			if (64 * DEFAULT_T1 < 32000)
				(*ict)->timer_d_length = 32000;
			else
				(*ict)->timer_d_length = 64 * DEFAULT_T1;
			osip_gettimeofday(&(*ict)->timer_a_start, NULL);
			add_gettimeofday(&(*ict)->timer_a_start, (*ict)->timer_a_length);
			(*ict)->timer_d_start.tv_sec = -1;	/* not started */
		} else {				/* reliable protocol is used: */
			(*ict)->timer_a_length = -1;	/* A is not ACTIVE */
			(*ict)->timer_d_length = 0;	/* MUST do the transition immediatly */
			(*ict)->timer_a_start.tv_sec = -1;	/* not started */
			(*ict)->timer_d_start.tv_sec = -1;	/* not started */
		}
	}
#else
		if (osip_strcasecmp(proto, "TCP") != 0 && osip_strcasecmp(proto, "TLS") != 0 && osip_strcasecmp(proto, "SCTP") != 0) {	/* for other reliable protocol than TCP, the timer
																																   must be desactived by the external application */
			(*ict)->timer_a_length = DEFAULT_T1;
			if (64 * DEFAULT_T1 < 32000)
				(*ict)->timer_d_length = 32000;
			else
				(*ict)->timer_d_length = 64 * DEFAULT_T1;
			osip_gettimeofday(&(*ict)->timer_a_start, NULL);
			add_gettimeofday(&(*ict)->timer_a_start, (*ict)->timer_a_length);
			(*ict)->timer_d_start.tv_sec = -1;	/* not started */
		} else {				/* reliable protocol is used: */
			(*ict)->timer_a_length = DEFAULT_T1;
			(*ict)->timer_d_length = 0;	/* MUST do the transition immediatly */
			osip_gettimeofday(&(*ict)->timer_a_start, NULL);
			add_gettimeofday(&(*ict)->timer_a_start, (*ict)->timer_a_length);
			(*ict)->timer_d_start.tv_sec = -1;	/* not started */
		}
	}
#endif

	/* for PROXY, the destination MUST be set by the application layer,
	   this one may not be correct. */
	osip_message_get_route(invite, 0, &route);
	if (route != NULL && route->url != NULL) {
		osip_uri_param_t *lr_param;

		osip_uri_uparam_get_byname(route->url, "lr", &lr_param);
		if (lr_param == NULL) {
			/* using uncompliant proxy: destination is the request-uri */
			route = NULL;
		}
	}

	if (route != NULL && route->url != NULL) {
		int port = 5060;

		if (route->url->port != NULL)
			port = osip_atoi(route->url->port);
		osip_ict_set_destination((*ict), osip_strdup(route->url->host), port);
	} else {
		int port = 5060;
		/* search for maddr parameter */
		osip_uri_param_t *maddr_param = NULL;

		port = 5060;
		if (invite->req_uri->port != NULL)
			port = osip_atoi(invite->req_uri->port);

		osip_uri_uparam_get_byname(invite->req_uri, "maddr", &maddr_param);
		if (maddr_param != NULL && maddr_param->gvalue != NULL)
			osip_ict_set_destination((*ict), osip_strdup(maddr_param->gvalue),
									 port);
		else
			osip_ict_set_destination((*ict), osip_strdup(invite->req_uri->host),
									 port);
	}

	(*ict)->timer_b_length = 64 * DEFAULT_T1;
	osip_gettimeofday(&(*ict)->timer_b_start, NULL);
	add_gettimeofday(&(*ict)->timer_b_start, (*ict)->timer_b_length);

	/* Oups! A bug! */
	/*  (*ict)->port  = 5060; */

	return OSIP_SUCCESS;
}

int __osip_ict_free(osip_ict_t * ict)
{
	if (ict == NULL)
		return OSIP_SUCCESS;
	OSIP_TRACE(osip_trace
			   (__FILE__, __LINE__, OSIP_INFO2, NULL, "free ict ressource\n"));

	osip_free(ict->destination);
	osip_free(ict);
	return OSIP_SUCCESS;
}

int osip_ict_set_destination(osip_ict_t * ict, char *destination, int port)
{
	if (ict == NULL)
		return OSIP_BADPARAMETER;
	if (ict->destination != NULL)
		osip_free(ict->destination);
	ict->destination = destination;
	ict->port = port;
	return OSIP_SUCCESS;
}

osip_event_t *__osip_ict_need_timer_a_event(osip_ict_t * ict, state_t state,
											int transactionid)
{
	return __osip_transaction_need_timer_x_event(ict, &ict->timer_a_start,
												 state == ICT_CALLING,
												 transactionid, TIMEOUT_A);
}

osip_event_t *__osip_ict_need_timer_b_event(osip_ict_t * ict, state_t state,
											int transactionid)
{
	return __osip_transaction_need_timer_x_event(ict, &ict->timer_b_start,
												 state == ICT_CALLING,
												 transactionid, TIMEOUT_B);
}

osip_event_t *__osip_ict_need_timer_d_event(osip_ict_t * ict, state_t state,
											int transactionid)
{
	return __osip_transaction_need_timer_x_event(ict, &ict->timer_d_start,
												 state == ICT_COMPLETED,
												 transactionid, TIMEOUT_D);
}
